Fig. 14 in The ammonoids from the Gattendorfia Limestone of Gattendorf (Devonian-Carboniferous boundary; Upper Franconia, Germany)

Fig. 14. Stockumites parallelus Korn & Weyer, 2023 from Gattendorf. A. Cross section of specimen MB.C.31268 (Korn 1989 Coll.) from bed 21c–d. B. Cross section of specimen BGRB X13394 (Schindewolf 1934 Coll.) from bed 21. C. Cross section of specimen BGRB X13395 (Schindewolf 1934 Coll.) from bed 21. D–F. Ontogenetic development of the conch width index (ww/dm), umbilical width index (uw/dm), whorl width index (ww/wh) and whorl expansion rate (WER) of selected specimens. Scale bar units= 1 mm.